Estivation
Guides
Chrysolina hyperici
Saint John's Wort Beetle, St. Johnswort Beetle, Klamathweed Beetle
Chrysolina hyperici is a leaf-feeding chrysomelid beetle native to Europe and Asia, widely introduced as a biological control agent for invasive St. John's wort (Hypericum perforatum). The species has been established in North America, Australia, and other regions where its host plant has become problematic. Populations are often transient and alone do not provide sustained weed suppression, though the beetle can mechanically vector a host-specific fungal pathogen that enhances control effectiveness.
Nymphalis californica
California Tortoiseshell, Cal Tortie
The California Tortoiseshell is a medium-sized brushfoot butterfly known for its mass migration events that can occur at irregular intervals. Adults overwinter and may be seen sunning on mild winter days. The species is notable for its seasonal altitudinal migration pattern and its ability to defoliate stands of Ceanothus host plants during population outbreaks.